Explainer-What caused the floods in Libya and why are they so bad?

After pummelling other Mediterranean countries, the powerful Storm Daniel swept into Libya at the weekend, unleashing record amounts of rain as it made landfall. The rain dumped by the storm filled a normally dry riverbed, or wadi, in the hills south of Derna. The head of the World Meteorological Organization (WMO) said on Thursday that casualties could have been avoided if the divided country, shattered by some 12 years of conflict and chaos, had a functional weather service able to issue warnings.